<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="http://localhost:8080/center" method="post">
        <label for=""><span>账号：</span><input type="text" name="id" id=""></label>
        <label for=""><span>密码：</span><input type="text" name="password" id=""></label>
        <button>提交</button>
    </form>
    <script>
        alert("账号或密码输入错误!")
    </script>
</body>
</html>